Pulley.



No. 840,763. PAT-ENTED JAN. 8',- 1907.

H. J. GILBERT.

PULLBY. APPLIOATXON nun win; a, 1903.

2 SHEETS-SHEET 1.

PATENTED JAN. 8, 1907. H. J. GILBERT.

PULLBY.

APPLICATION FILED JUNE 9, 03-

2 SHBETS'SHEET 2,.

UNITE l HENRY J. GILlERT, OF SAGINAW, MICHIGAN.v

PuLLEY.

nasao es.

Specification of Letters Patent.

Patented Jan. 8, 1907.

Application filed June 9, 1903. Serial No. 160.730.

To all whom it may concern:

Be it known that. I, HENRY J. GILBERT, a citizen of the United States,residing at Saginaw, in the county of Saginaw and State of Michigan,have invented certain new and useful. Improvements in Pulleys, of whichthe following is a description, reference being had to the accompanyingdrawings, forming part of this specification.

My invention relates more specifically to pulleys constructed of sheetmetal, and has for one of its objects the production of a sheet-metalpulley of such construction that a pulley of any desired width .of facemay be readily built up from uniform spoke and hub construction, wherebythe provision of differing spoke and hub constructions for pulleys ofdifferent widths is rendered unneces sary.

Another object of my invention is the provision of more efficient spokeand rim connections of sheet-metal pulleys than have heretofore beendevised.

A third object of my invention is the provision of novel interchangeablebushings for sheet-metal pulleys and means for detachably connectingsuch bushings with the hub of the pulley.

My invention has for further objects increased .simplicity and economyof construction and increased durability and efficiency of operation ofpulleys of this character.

In the accompanying drawings, Figure 1 is a side elevation, partly insection, of one form of my improved pulley; Fig. 2, a bottom plan Viewof the upper half of said pulley; Fig. 3, a view corresponding to Fig.2, but

' showing a wider-faced pulley employing a plurality of sets ofspoke-arms Fig. 4, a cross-sectional detail on the line 4 4 of Fig. 1,showing the shape of the spoke-arms in crosssection; Fig. 5, a detail ofthe rim end of one of the spoke-arms prior to the bending of itsrim-engaging end tongues; Fig. 6, a view corresponding to Fig. 5,showing the end of the spoke-arm in its final shape; Figs. 7 and 8,details of the rim connections of said spokearms; Figs. 9 and 10,details of the rim connections; Fig. 11, a sectional detail of the spokeand rim connection for crown-faced pulleys; Fig. 12, a side elevation ofthe hub portion of the pulley of Fig. 1 with an interchangeable bushingin position in it, and Fig. 13, a perspective detail of the bushingshown in Fig. 12.

The same letters of reference are used to indicate identical parts inthe several views.

Under the construction illustrated in'Fig. 1 of the drawings the rim ofmy improved pulley is composed of two semicircular halves A B, whichabut together at their meeting ends to form the complete circular rim.The blank for each of these half-rims is of somewhat greater length thanis necessary to form the semicircular half-rim of the pulley, and theends of these blanks are bent inwardly and backwardly parallel with theouter face of the pulley-rim to form sockets or recesses to receive theends of the spoke-arms. The spoke-arms C D extend from side to side, ofthe pulley parallel with each other, and the opposite ends of each armare secured to the ends of the corresponding half-rim of the pulley.These spoke-arms are formed in suitablev dies from blanks of sheet metaland in crosssection are approximately U-shaped, as shown in Fig. 4. Eacharm consists of a curved hub portion and two radially-extending portionsleading from such hub portion to the ends of the half-rim to which thespoke-arm is secured. The hub portions of t ese spoke-arms may fitdirectly upon the shaft or interposed bushing, (where bushings are-ernployed but I prefer to secure each of them to a half-thimble E ofslightlyless extent than a half-circle by a rivet F. Upon opposite sidesof their hub port-ions each pair of spoke-arms is provided with 00-incident bolt-holes G, Figs. 2 and 8, for the passage of theclamping-bolts H, by means of which the slightly-separated spoke-armsand the half-rinis carried by them are clamped to the shaft upon whichthe pulley is to be used.

The formation of the ehd's'of thespoke arms for attachment to therim-sections in the manner shown in Fig. 1 will be understood byreference to Figs. 5 and 6, where it will be seen that the flattened topof the spoke-arm is slit backward fromits end along the lines a 0.,thereby forming a middle tongue b and two side tongues c, after whichthe twoside tongues are bent outwardly or laterally at'right angles tothe sides of the spoke-arm, as in Fig. 6, while the 10 5 middle tongueI) is bent downwardly at right angles to the upper-side of the spoke-armand into the same plane as the laterally-projecting tongues c. All threeof these tongues fit into the socket or recess formed by the inturnedflange d of the pulley-rim, as shown in Fig. 7, the middle tongue I)fitting in said socket in line with the body of the spoke-arm and beingriveted therein, as shown in Figs. 1, 2, and 3, while thelaterally-projecting tongues c are embraced by the inturned flange ofthe rim at opposite sides of the body of the spoke-arm and rivetedthereto. As shown in Fig. 8, the flange of the pulley rim is providedwith suitable slots e coincident with the sides of the spoke-arm topermit the engagement of the tongues of the spoke-arm with the socket orrecess formed by the flange in the manner described. In practicespoke-arm blanks of considerably greater length than the diameter of thepulley will preferably be employed in order to provide relatively longlaterally-projecting tongues c, and the middle tongue I) will be cutaway or made shorter, as indicated by the dotted line in Fig. 5, so asto fit properly in the socket formed for it by the flange of thepulley-rim-. The. laterally-projecting tongues c may be made ofsuflicient length to eX- tend approximately the entire width of thepulley-rim in single-armed narrow-faced pulleys, as in Fig. 2, and toextend into proximity to. or contact with the tongues of the adjacentspoke-arms when a plurality of sets of spoke-arms are employed in awide-faced pulley, as in Fig. 8. In event the outer pairs of spoke-armsin such wide-facei pulley are set near the edge of the pulley-rim, as inFig. 3, the outwardly-projecting flanges c of such spoke-arms may beomitted, as there shown.

Near their outer ends the spoke-arms C D are provided with coincidentbolt-holes I, Figs. 2 and 3, for the reception of the clamping-bolts J,by means of which the meeting ends of the rim of the pulley are securedto- I gether. The opposite edges of the pulleyrim are rolled intotubular form and connected by dowel-pins K at their meeting ends, asshown at the left side of the pulley in Fig. 1, to resist sidewise ortorsional strain upon the two halves of the pulley. For the purpose offurther strengthening wide-faced pulleys against such strains I providethe arrangement shown in Figs. 9 and 10, where it will be seen that themeeting end of one rim is provided with a slot or opening :0 to receivea tongue y, formed u on and projecting from the meeting end of the opposite rim, said tongue being formed by slitting the inturned flange dof the latter rim and bending it outward into approximately the plane ofthe rim.

' For crown-faced pulleys I provide the arrangement shown in Fig. 11,where I employ a crowning-piece Z, interposed between the outer ends ofthe spoke-arms and the rim of the pulley, the rivets which attach therim to the s eke-arms passing through this piece. The ength of thesecrowning-pieces Z will and by these means, therefore,

correspond or be proportionate to the width of the face of the pulley,while their width will preferably be about the same as the width of theerid flanges c of the spoke-arm. In the pulley shown in the drawingsfour such crowning-pieces would be employed, two in each half of thepulley, between the opposite ends of the spoke-arms and the adjacentends of the half-rim.

Under the foregoing construction a narrow-faced pulley may be built upof a pair of half-rims and a single pair of parallel spokearms, as inFigs. 1 and 2, or a wide-faced pul ley may be built up of a pair ofwider halfrims and a plurality of pairs or sets of the same spoke-arms,as in Fig. 3, in which latter case the half-thiinbles E will preferablybe of sufficient length to connect the spoke-arms of all of the pairsemployed. I11 this manner pulleys of any desired width of face may bereadily constructed by employing a suflicient number of pairs ofspoke-arms of uniform, size, shape, and construction so that for allpulleys of a given diameter it will sullice to provide a single standardconstruction of spoke-arms. Pulleys of this character are nearly alwaysemployed in connection with interchange able bushings, by means of whicha pulley of given shaft-bore may be applied to shafts of varyingdiameters less than such bore, and in Figs. 12 and 13 I have illustrateda novel construction and application of such bushings. These bushings N,of the shape shown in Fig. 13, may be formed in dies of sheet metal, andfor all pulleys employing more than a single pair of spoke-arms thebushings are or may be identical with each other excepting in diameter,such bushings being preferably of approximately the same width as thespoke-arms. In narrow-faced pulleys employing a single pair ofspoke-arms wider bushings will preferably be provided, approximately ofthe same width as the length of the hub-thimbles of the spoke-arms. Forconvenience in assembling these bushings in the hub of a wide-facedpulley and holding them in proper position while the pulley is beingapplied to the shaft, as well as for conven. ience in attaching thebushings to the pulleyhubs for purposes of transportation or otherwise,I provide novel means for detachably connecting each half-bushing withthe'halfthimble of the spoke-arms in which it fits. For this purpose Iprovide each of the halfthimbles E with a cncular opening L, having anarrow offset opening M, Figs. 2 and 3, and I secure to eachhalf-bushing a suitable engaging and connecting device to cooperate withthis opening in the thimble. Such device may consist of a button-headrivet 0, Figs. 12 and 13, of such length and secured to the bushing insuch position that when the bushing is applied to the hub the head ofthe rivet may pass through the opening L in the hub-thimble and thebushing be then turned to normal position in the hub and the stem of therivet caused to enterthe narrow offset opening M, as in Fig. 12, so thatthe head of the rivet will then serve to connect the bushing with thethimble and hold it in position. The bushing may be readily detached byturning it backward in the hub; but otherwise it is securely connectedto the hub for purposes of assemblage and transportation.

The foregoing construction is efficient for pulleys of small and mediumsize; but for pulleys of larger size it is desirable to employadditional spoke-arms radiating from the hub of the pulley at rightangles to the spokearms above described. For this purpose independentauxiliary s oke-arms, secured at their inner ends to t e hubs of the.main spoke-arms and at their outer ends to the ulley-rim, may beemployed, as indicated by the dotted lines X in Fig. 1; but I havedevised a better construction and arrangement for the purpose and madethe same the subject-matter of a separate application for LettersPatent. V Having thus fully described my invention, I claim 1. Aseparable pulley comprising sheetmetal rim-segments, a plurality of setsof spoke-arms of uniform construction formedof sheet metal and securedin said rim-segments, half-thimbles in the shaft-opening of the hubportions ofthe spoke-arms, formed of sheet metal, and secured toand'permanently connecting the several sets of arms, and clamping-boltsfor securin the pulleyhalves to the shaft; substantially as and for thepurpose described.

2. A separ ble pulley comprising sheetmetal rim-segments, a plurality ofsets of spoke-arms of uniform construction formed of sheet metal andsecured in said rim-segments, and each composed of a hub portion andintegral radial arms, half-thimbles in the shaft-opening of the hubportions of the spoke-arms formed of sheet metal and secured to andpermanently connecting the several sets of arms, and clamping-bolts forsecuring the pulley-halves to the shaft; substantiallyas and for thepurpose described.

A separable pulley comprising sheetmetal rim-segments, a plurality ofsets of sheet-metal spoke-arms of uniform construction secured in saidrim-se ments, each spokearm being of approximate y U shape incrosssection and comprising a hub portion and two integralradially-extending arms secured at their outer ends to the rim-segments,halfthimbles in the shaft-opening of the hub portions of the spoke-armsformed of sheet metal and secured to and permanently connecting theseveral sets of arms, and clamping-bolts for securin the pulley-halvesto the shaft; substantial y as and for the purpose described.

4. A se arable pulley comprising the sheetmetal ha -rims A B, thespoke-arms C D formed of sheet metal approximately U- shaped incross-section and comprising the hub portions and the radially extendingarms secured at their outer ends to the half- 'rims, and thehalf-thimbles E E formed of sheet metal and permanently secured in thehub portions of the spoke-arms; substantially as described. I I.

5. A sheet-metal pulley comprising rimsegments having their meeting endsbent inward-and backward to form sockets or recesses, and spoke-armsprovided with suitably-shaped ends to engage such sockets and riveted tothe rim; substantially as described.

6. A sheet-metal pulley comprising rimsegments having their meeting endsbent inward and backward to form sockets or recesses, and sheet-metalspoke-arms provided with laterally-projecting end tongues fitting insaid sockets and riveted to the rim; sub stantially as described.

7. A sheet-metal pulley comprising rimsegments having their meeting endsbent inward. and backward to form sockets or recesses, and sheet-metalspoke-arms provided with end tongues bent vertically orcircumferentially of the ulley and fitting in said sockets and rivetedto the rim; substantially as described.

8. A sheet-metal pulley comprising rimsegments having their meeting endsbent inward and backward to form sockets or recesses, and sheet-metalspoke-arms provided with laterally and vertically projecting end tonguesfitting in said sockets and riveted to the rim; substantially asdescribed.

9. A sheet-metal pulley comprising rimsegments having their meeting endsbent inward and backward to form the flanges 11 and inclosed sockets orrecesses, and the sheetmetal spoke-arms approximately U shape incross-section and having their ends slit and bent outward to form thetongues c fitting in said sockets and riveted to the rim; substantiallyas described.

10. A sheet-metal pulley comprising rim.

segments having their meeting ends bent inward and backward to form theflanges d and inclosed sockets or recesses, and the sheetmetalspoke-arms approximately U shape in cross-section and having their endsslit and bent laterally and vertically to form the ton ues c and clfitting in said sockets and rivete to the rim; substantially asdescribed.

11. The herein-described se arable pulley,

comprising the sheet-metal alfrims A B having their meeting ends bentinward and backward to form the flanges d and inclosed sockets orrecesses, and the air of parallel spoke-arms C D, formed of slieetmetal, approximately U-shaped in cross-section, and comprising the hubportions and the radiallyextending parallel arms, the outer ends oftending parallel arms, the outer ends of said arms being slit and benttoform the tongues b c fitting in the sockets in the meeting ends of therim and riveted thereto, and the halfthimbles E E secured in the hubportions of the respective spoke-arms; substantially as described.

13. The herein-described separable pulley, comprising the sheet-metalhalf-rims A B, having their meeting ends bent inward and backward toform the flanges d and inclosed sockets or recesses, the pslurality ofpairs of parallel spoke-arms C each spoke-arm formed of sheet metal,approximately U- shaped in cross-section, and comprising a hub portionand the radially-extending parallel arms slit and bent at their outerends to form the tongues b c fitting in the sockets in the meeting endsof the rim and riveted thereto, and the half-thimbles E E secured in thehub portions of the respective spoke-arms and connecting the arms of theseveral pairs; substantially as described.

14. In a sheet-metal pulley, the rim-sections having their meeting endsbent inward and backward to form the inturned flanges d d, one of saidmeeting ends being provided with the opening at and the other having thetongue y cut from its flange (Z and passed through said opening 00;substantially as described.

15. In a crown-faced sheet-metal pulley, the combination of therim-segments, the spoke-arms provided at their outer ends with therim-connecting tongues, and the crowning-pieces Z interposed betweensaid tongues and rim and riveted thereto; substantially as described.

16. In a crown-faced sheet-metal pulley, the combination of therim-segments, the U- shaped sheet-metal spoke-arms slit and bent attheir outer ends to form the rim-connecting tongues b c, and thecrowning-pieces Z having approximately straight or flat inner faceshtting against said tongues and convex outer faces conforming to thecrown of the pulley and riveted between the tongues and rim;substantially as described.

17. In a separable pulley, the combination, with the separable portionsof the pulley, of separable bushings, and means for detachab y securingsaid bushings in the hubs of the respective portions of the pulley whilesaid portions are separate from each other, so that in assembling thepulley upon a shaft the bushings will be held in place in the hubportions of the pulley by the means connecting them therewithsubstantially as described.

18. A separable Jpulley having its hub portions provided wit combinationwith separable bus rings provided with devices to engage the recesses oropenings in the.hub portions of the ulley and detachably secure thebushings tlierein while the pulley portions are separate from eachother; substantially as and for the purpose described.

19. A sheet-metal pulley having its hub provided with an opening L andofl'set M therefrom, in combination with a bushing N having the headedprojection 0 adapted to cooperate with said opening and ofl'set in themanner and for the purpose described.

20. The herein-described sheet-metal pulley having the half-thimbles Esecured in its opposite hub portions and provided with the openings Lhaving the ofl'sets M, in combination with the bushings N provided withthe headed projections O cooperating with said openings and theiroffsets, as described.

HENRY J. GILBERT. Witnesses:

EDWARD REoToR, LOUIS B. ERWIN.

recesses or o )enings, in,

